1. Medical Research Center The Affiliated Hospital of Qingdao University Qingdao China
2. Department of Nephrology The Affiliated Qingdao Municipal Hospital of Qingdao University Qingdao China
3. Department of Gastroenterology The Affiliated Hospital of Qingdao University Qingdao China
4. Department of Physiology Qingdao University Qingdao China